Here's a website that connects you to resources (FOR FREE) in many (if not all) subjects! It looks pretty cool, I've only checked out a few of the links so make sure you go thru them first to make sure your ok with the materials presented!
http://free.ed.gov/#t129
ALSO..some science stuff. So far everything I've seen is free (even the sites that required registration).
http://www.nsta.org/publications/freebies.aspx
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